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(No Model.)v 3 Sheets-Sheet 1.

J. H. GUEST.

ELECTRICl ARG LAMP.

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(No Model.) 3 Sheets-Sheet 2. J. H. GUEST.

BLEGTRIG ARG LAMP. 1 vNo. 260,975. Patented July 1l, 1882.

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ELECTRIC ARG LAMP. No. 260,975. Patented July 11, 1882.

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UNITED STATES PATENT OFFICE.'

JOHN H. GUEST, OF BROOKLYJ, NE YORK.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 260,975, dated July 11,1882.

Application filed May 23, 18H2. (No model.)

To all whom 'it may concern Be it known that I, JOHN H. GUEST, ofBrooklyn, in the county of Kings and State of New York, have invented anImprovement in Electric-Arc Lamps, of which the followingis aspecification.

In some electric lamps there is one magnet for drawing down the lowercarbon and establishing the arc and another magnet for giving a positivefeed to the carbon as the arc increases and the current in the maincircuit lessens.

The object of my present invention is to dispense with the magnet in thelower part of the lamp that separates the carbons, and at the same timeobtain apositive feed from the differential action ot' electro-magnets,as distinguished from those electriclam'psin which the feed is notpositive or in which the arc is established by the same magnets andintervening mechanism which feeds the carbons.

In my present improvement I employ two pawls worked by the differentialmagnets. One of them serves to separate the carbons and the other tofeed the carbons. As soon as the current is applied the first pawl actsto separate the carbons, and itisinstantly thrown out of action, leavingthe carbons under the control of the second pawl to feed the same asconsumed.

In the drawings, Figure l is an elevation of the lamp mechanism in theact of separating the carbons. Fig. 2 is a corresponding View with partof the mechanism partially in section and with the separating-pawldisconnected. Fig. 3 is a sectional plan. Fig. 41s adiagram of thecircuit-connections. Fig. 5 is a section of the feed-wheels and shaft,and Fig. 6 represents the shunt-circuit connection and friction-lever.

The top plate, a, and bottom plate, l), are connected by the studs orcolumns ct', and a movable case, b', surrounds the parts to protect thesame. The tubular rack c receives at its lower end the carbon c', andthe lower carbon, d, is supported in any usual manner. The current fromthe insulated l binding-post c passes through the coarse-wire helix H,thence by the parts of the lamp or the. spring-contact e andcarbon-holder rack c and carbons, and returns to the e binding-post f.The fine-wire helix F isin a shunt-circuitbetween the and binding-posts.The helices F and H have solenoid-cores tlc, respectively, that arelinked at 2 and 3 to the ends of the rocking lever l, which is free tobe rocked or turned upon the sleeve n of the shaft o. The shaft o is inbearings or supports 4 4, and it has fixed permanently to it thefriction-wheel p, and upon the sleeve n is a ratchet-wheel, s, the teethot' which engage with a spring-pawl, s', pivoted on the inner face ofthe friction-wheelp. There is a pinion, r, upon the sleeve n, gearinginto the rack-tube c of the carbon-holder. This pinion r is held againsta collar on the sleeve by the spring r. The friction is sufficient tohold the weight ot the carbon-holder and carbon, but the rack may bemoved up or down by hand. The directions of the ratchet-wheel teeth andpawl sl are such that the carbonholder cannot descend without turningthe frictionwheel, but the sleeve and ratchet-wheel can be turned inraising the carbon-holder.

On the periphery ofthe friction-wheel there is a pad, 10, that iscarried by a spring, l1. It may bear constantly upon the friction-wheelwith enough force to suspend the carbon and carbon-holder; but I preferto use the lever t to apply pressure to the friction-pad, said lever tbeing acted upon bythe attraction of the core of the solenoid H when thecurrent passes through the lamp; but when the current through the lampceases, or nearly so, the solenoid no longer holds the lever t, and thesame, being drawn down by the spring 12, (see Fig. 6,) relieves thepressure upon the friction pad and allows the parts to turn by theweight of the carbon and holder. This permits the upper carbon todescend into Contact, or nearly so, with the lower carbon, when thecurrent through the lamp is considerably lessened or ceases. This'levert is formed with a softiron armature-ring at the end adjacent to the magnet H, so that the solenoid-core can pass freely through the same; butthe magnetism set up in the core will draw this ring toward the helixwhen there is a current passing through H.

T-he sleeve n has upon it the two toothed wheels c and to, and the leverl is preferably between them. There are two pa-wls acted upon by thelever. One pawl, 25, standing in one direction, acts to turn the wheel'zo and IOO feed the carbon down, and the other pawl, 26, acts to raisethe carbon and separate the same from the lower carbon. The teeth of thewheel c are ne, and the second pawl, 26, is a tooth. upon a secondarylever, 27, pivoted upon the lever l at 15, and there are fixed stops at17 and 18, preferably in the form of taper-pointed screws, and there isa iat friction-sprin g, 20, on the lever I, acting against the side ofthe secondary lever, 27, to hold the same in any position into which itmay be moved. The pawl-tooth at 26 on this secondary lever is adapted totake the iine teeth of the wheel o.

Now, presuming the partsA are in the position shown by dotted lines inFig. 2, the weight of the solenoid-core k and the tension-spring 30 havedrawn the lever l and fulcrum 15 ot' the lever 27 down until thescrew-stop 18 at the base of the lamp is in contact with the end of thebent lever 27, has turned the same, and engaged the pawl-tooth 26 withthe teeth of the wheel This is the position of inaction. When acurrentis turned on, the solenoid H instantly draws up the core k and lever Z,and by tooth 26, which is engaged with the wheel o, the carbon israised, and as the parts come into the position shown byfull linesinFig.2 the tooth or pawl 26 is disengaged from contact with the Wheel cby the end of the pawl-lever 27 coming into contact with the fixed stop17. At the same moment the magnetism in -H applies pressure to thefriction-brake 10, and, the separation of the carbons being established,the feed is regulated and the distance preserved with uniformity by thedifferential action of the two magnets H F. If the carbons are'too farapart, the current in F, preponderating, moves the lever and causes thepawl 25 to feed down the carbon by turning the wheel w and pinion i. Asthe carhous approach each other the increase of magnetism in H draws thecore lr up and moves the lever and pawl 26 to take the teeth of thelwheel c. In this manner the proper separation of the carloons isestablished, and then the feed effected as required from time to time,and in case of the carbon breaking at its point or the current beingturned oil", the upper carbon descends into contact with the lowercarbon, these operations being performed by the two solenoid-magnets,one in the main circuit and the other in a shunt.

- In order to prevent any sudden movement of the solenoid-magnets or anyvibrations that might make the lamp flicker, I employ a piston, 44, in asmall cyliuder,45,containing glycerine or other suitable liquid. Thisforms la dash-pot, the piston of which is connected with 4 tact-block 36is provided with a stem, 40, extending through the top plate, a. If thelamp is extinguished or the current decreases in H below the minimumstandard, the lever t is drawn down by the spring 12, and allows thespring 42 to act upon the lever 38 and press the contact-block 36against the spring 37and close the shunt-circuit between the andbinding-posts. This shunt can be broken and the lamp restored to workingcondition by removing the small cap 39 and lifting the stem and thecontact-block 36 so that the latter rests upon the upper end of thelever 38.

If desired, the wheels may be turned by clamping blocks similar to wheelfeeds in sewing-machines instead of being operated upon by the pawls. l

I claim as my invention- 1. The combination, with the carbon-holder, ofa rack, a pinion engaged with such rack, ratchet-wheels c and w, alever, solenoid-magnets in the main and shunt circuits connected to thesaid lever, two pawls or teeth acting in opposite directions, and stopsto bring into action the pawl that acts to separate the carbons and todisconnect the same, substantially as set forth.

2. The lever l and pawl 25, in combination with the secondary lever,27,having the tooth or pawl 26, pivoted to the lever l, the spring 20, thestops 17 and 18, the toothed wheels c and tu, the pinion r, andcarbon-holder and solenoid-magnets, substantially as set forth.

3. In combination with the carbon-holder rack, gear-Wheel and toothedwheels, a lever, solenoid-magnets to move the same in oppositedirections, two pawls-one to raise the upper carbon, the other to feedthe samestops to bring into action and to disconnect the pawl that actsto separate the carbons, a frictionwheel, a brake, and a lever actuatedlby the magnet in the main circuit to apply friction while the current ispassing through the lamp and to relieve the friction when the light isextinguished, substantially as set forth.

4. In combination with the circuit-closing block 36, springs 37 and 42,and lever 38, the stem 40, passing through the top plate, and theremovable cap, substantially as set forth.

5. The combination, with the carbon-holder and rack c, pinion 1', leversand pawls acting in opposite directions, and the solenoid-magnets in themain and shunt circuits, of the dash-pot 45, and connection to the leverl, sub-y stantially as set forth. y

Signed by me this 20th day of May, A. D. 1882.

J. H. GUEST.

Witnesses:

GEO. T. PINcKNEY, CHAs. H. SMITH.

IUO

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